…the very means by which oustanding success declines makes the process doubly destructive to cities….For some reason, banks, insurance companies and prestige offices are consistently the most voracious double destroyers in this way. Look to see where banks or insurance companies are clustered, and you will too often see where a center of diversity has been supplanted, a knoll of vitality leveled. You will see a place that is already a has-been or is becoming so.

–The Death and Life of Great American Cities, Jane Jacobs